A component which is responsible for MQTT connection management. More...

#include <ksMqttConnector.h>

Inheritance diagram for ksf::comps::ksMqttConnector:

Public Types
enum class	QosLevel { QOS_AT_LEAST_ONCE , QOS_EXACTLY_ONCE }

Public Member Functions
virtual const size_t	getInstanceType () const
	Retrieves type ID of the object.

virtual bool	isA (const size_t id) const
	Checks whether object is of given type.

	ksMqttConnector (bool sendConnectionStatus=true, bool usePersistentSession=false)
	Constructs ksMqttConnector object.

bool	init (ksApplication *app) override
	Instantiates the MQTT connector component.

bool	postInit (ksApplication *app) override
	Method that handles component post-initialization.

bool	loop (ksApplication *app) override
	Executes MQTT connection logic.

bool	isConnected () const
	Retrieves connection state.

uint32_t	getConnectionTimeSeconds () const
	Retrieves connection time in seconds.

uint32_t	getReconnectCounter () const
	Retrieves MQTT reconnect counter.

void	subscribe (const std::string &topic, bool skipDevicePrefix=false, ksMqttConnector::QosLevel=ksMqttConnector::QosLevel::QOS_AT_LEAST_ONCE)
	Subscribes to MQTT topic.

void	unsubscribe (const std::string &topic, bool skipDevicePrefix=false)
	Unsubscribes the MQTT topic.

void	publish (const std::string &topic, const std::string &payload, bool retain=false, bool skipDevicePrefix=false)
	Publishes a message to the MQTT topic.

void	setupConnection (const std::string broker, const std::string &port, std::string login, std::string password, std::string prefix, const std::string &fingerprint)
	Sets up MQTT connection.

virtual	~ksMqttConnector ()
	Destructor (for uniqueptr purposes).

Public Member Functions inherited from ksf::ksRtti
template<typename TType >
TType *	as ()
	Tries to cast object to the type provided as a template parameter.

template<typename TType >
const TType *	as () const
	Tries to cast object to the type provided as a template parameter (const version).

Static Public Member Functions
static const size_t	getClassType ()

Static Public Member Functions inherited from ksf::ksComponent
static const size_t	getClassType ()

Public Attributes
std::shared_ptr< ksf::evt::ksEvent< const std::string_view &, const std::string_view & > >	onDeviceMessage {std::make_shared<ksf::evt::ksEvent<const std::string_view&, const std::string_view&>>()}
	onDeviceMessage event that user can bind to.

std::shared_ptr< ksf::evt::ksEvent< const std::string_view &, const std::string_view & > >	onAnyMessage {std::make_shared<ksf::evt::ksEvent<const std::string_view&, const std::string_view&>>()}
	onAnyMessage event that user can bind to.

std::shared_ptr< ksf::evt::ksEvent<> >	onConnected {std::make_shared<ksf::evt::ksEvent<>>()}
	onConnected event that user can bind to.

std::shared_ptr< ksf::evt::ksEvent<> >	onDisconnected {std::make_shared<ksf::evt::ksEvent<>>()}
	onDisconnected event that user can bind to.

Protected Member Functions
bool	connectToBroker ()
	Connects to the MQTT broker.

void	mqttConnectedInternal ()
	Connects to the MQTT broker (internal function).

void	mqttMessageInternal (const char topic, const uint8_t payload, uint32_t length)
	Called when MQTT message arrives (internal function).

Protected Attributes
std::unique_ptr< WiFiClient >	netClientUq
	Shared pointer to WiFiClient used to connect to MQTT.

std::unique_ptr< PubSubClient >	mqttClientUq
	Shared pointer to PubSubClient used to connect to MQTT.

std::weak_ptr< ksWifiConnector >	wifiConnWp
	Weak pointer to WiFi connector.

uint64_t	lastSuccessConnectionTime {0}
	Time of connection to MQTT broker in seconds.

uint32_t	reconnectCounter {0}
	MQTT reconnection counter.

struct {

bool sendConnectionStatus: 1
	Send connection status to MQTT or not.

bool usePersistentSession: 1
	Use persistent session or not.

bool wasConnected: 1
	True if connected in previous loop.

}	bitflags = {true, false, true}

ksSimpleTimer	reconnectTimer { 10000UL }
	Timer that counts time between reconnection attempts.

std::string	login
	Saved MQTT login.

std::string	password
	Saved MQTT password.

std::string	prefix
	Saved MQTT prefix.

std::string	broker
	Saved MQTT broker.

uint16_t	portNumber {1883}
	Saved MQTT port number.

std::unique_ptr< ksCertFingerprint >	certFingerprint
	Shared pointer to fingerprint validator.

Protected Attributes inherited from ksf::ksComponent
ksComponentState::TYPE	componentState { ksComponentState::NotInitialized }

Detailed Description

A component which is responsible for MQTT connection management.

The component is responsible for MQTT prefix handling, connection time counting as well as connection status reporting. This component provides public methods that can be used to publish a message.

The user can register event handlers to receive connection state events as well as message arrival event.

Constructor & Destructor Documentation

◆ ksMqttConnector()

ksf::comps::ksMqttConnector::ksMqttConnector	(	bool	sendConnectionStatus = true,
		bool	usePersistentSession = false )

Constructs ksMqttConnector object.

Parameters

sendConnectionStatus	Indicates whether last will message should be used to signal device state.
usePersistentSession	Indicates whether the session should be persistent.

References sendConnectionStatus, and usePersistentSession.

Member Function Documentation

◆ connectToBroker()

bool ksf::comps::ksMqttConnector::connectToBroker ( )

protected

Connects to the MQTT broker.

Returns: True on success, false on fail.

References broker, certFingerprint, login, mqttClientUq, netClientUq, password, portNumber, and prefix.

Referenced by loop().

◆ getConnectionTimeSeconds()

uint32_t ksf::comps::ksMqttConnector::getConnectionTimeSeconds ( ) const

Retrieves connection time in seconds.

Returns: MQTT connection time in seconds.

References isConnected(), and lastSuccessConnectionTime.

◆ getInstanceType()

virtual const size_t ksf::comps::ksMqttConnector::getInstanceType ( ) const

inlinevirtual

Retrieves type ID of the object.

Returns: Object type ID.

Reimplemented from ksf::ksComponent.

◆ getReconnectCounter()

uint32_t ksf::comps::ksMqttConnector::getReconnectCounter ( ) const

inline

Retrieves MQTT reconnect counter.

Returns: Number of MQTT reconnects.

References reconnectCounter.

◆ init()

bool ksf::comps::ksMqttConnector::init ( ksApplication * app )

overridevirtual

Instantiates the MQTT connector component.

Parameters

app	Pointer to the parent ksApplication.

Returns: True on success, false on fail.

Reimplemented from ksf::ksComponent.

References ksf::ksComponent::init(), mqttClientUq, and ksf::comps::ksMqttConfigProvider::setupMqttConnector().

◆ isA()

virtual bool ksf::comps::ksMqttConnector::isA ( const size_t id ) const

inlinevirtual

Checks whether object is of given type.

Parameters

id	Type ID to check against.

Returns: True if object is of given type, otherwise false.

Reimplemented from ksf::ksComponent.

◆ isConnected()

bool ksf::comps::ksMqttConnector::isConnected ( ) const

Retrieves connection state.

Returns: True if connected, otherwise false.

References mqttClientUq.

Referenced by getConnectionTimeSeconds().

◆ loop()

bool ksf::comps::ksMqttConnector::loop ( ksApplication * app )

overridevirtual

Executes MQTT connection logic.

Returns: True on success, false on fail.

Reimplemented from ksf::ksComponent.

References ksf::evt::ksEvent< Params >::broadcast(), connectToBroker(), ksf::ksSimpleTimer::hasTimePassed(), mqttClientUq, mqttConnectedInternal(), onDisconnected, reconnectCounter, reconnectTimer, ksf::ksSimpleTimer::restart(), and wifiConnWp.

◆ mqttConnectedInternal()

void ksf::comps::ksMqttConnector::mqttConnectedInternal ( )

protected

Connects to the MQTT broker (internal function).

Binds onMessage callback, calls bound onConnected callbacks and is used to configures parameters.

References ksf::evt::ksEvent< Params >::broadcast(), lastSuccessConnectionTime, mqttClientUq, mqttMessageInternal(), and onConnected.

Referenced by loop().

◆ mqttMessageInternal()

void ksf::comps::ksMqttConnector::mqttMessageInternal	(	const char *	topic,
		const uint8_t *	payload,
		uint32_t	length )

protected

Called when MQTT message arrives (internal function).

Parameters

topic	Topic that received the message.
payload	Payload of the message.
length	Length of the payload.

References ksf::evt::ksEvent< Params >::broadcast(), ksf::evt::ksEvent< Params >::isBound(), onAnyMessage, onDeviceMessage, and prefix.

Referenced by mqttConnectedInternal().

◆ postInit()

bool ksf::comps::ksMqttConnector::postInit ( ksApplication * app )

overridevirtual

Method that handles component post-initialization.

Used to setup callbacks.

Parameters

app	Pointer to the parent ksApplication.

Returns: True on success, false on fail.

Reimplemented from ksf::ksComponent.

References ksf::ksApplication::findComponent(), and wifiConnWp.

◆ publish()

void ksf::comps::ksMqttConnector::publish	(	const std::string &	topic,
		const std::string &	payload,
		bool	retain = false,
		bool	skipDevicePrefix = false )

Publishes a message to the MQTT topic.

Parameters

topic	Target topic name.
payload	Payload to be transmitted.
retain	True if this publish should be retained, otherwise false.
skipDevicePrefix	True if device prefix shouldn't be inserted to the topic, false otherwise.

References mqttClientUq, and prefix.

◆ setupConnection()

void ksf::comps::ksMqttConnector::setupConnection	(	const std::string	broker,
		const std::string &	port,
		std::string	login,
		std::string	password,
		std::string	prefix,
		const std::string &	fingerprint )

Sets up MQTT connection.

Parameters

broker	MQTT broker address. Can be IP or hostname
port	MQTT broker port
login	MQTT user login
password	MQTT user password
fingerprint	MQTT broker certificate fingerprint - if empty, secure connection won't be used

References broker, certFingerprint, login, mqttClientUq, netClientUq, password, portNumber, and prefix.

Referenced by ksf::comps::ksMqttConfigProvider::setupMqttConnector().

◆ subscribe()

void ksf::comps::ksMqttConnector::subscribe	(	const std::string &	topic,
		bool	skipDevicePrefix = false,
		ksMqttConnector::QosLevel	qos = ksMqttConnector::QosLevel::QOS_AT_LEAST_ONCE )

Subscribes to MQTT topic.

Parameters

topic	Topic to subscribe
skipDevicePrefix	True if device prefix shouldn't be inserted before passed topic, false otherwise.
qos	Quality of service level (QOS).

References mqttClientUq, and prefix.

◆ unsubscribe()

void ksf::comps::ksMqttConnector::unsubscribe	(	const std::string &	topic,
		bool	skipDevicePrefix = false )

Unsubscribes the MQTT topic.

Parameters

topic	Topic to be unsubscribed.
skipDevicePrefix	True if the device prefix shouldn't be inserted to the topic, false othereide.

References mqttClientUq, and prefix.

The documentation for this class was generated from the following files:

src/ksf/comp/ksMqttConnector.h
src/ksf/comp/ksMqttConnector.cpp

Public Types

Public Member Functions

Static Public Member Functions

Public Attributes

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ ksMqttConnector()

Member Function Documentation

◆ connectToBroker()

◆ getConnectionTimeSeconds()

◆ getInstanceType()

◆ getReconnectCounter()

◆ init()

◆ isA()

◆ isConnected()

◆ loop()

◆ mqttConnectedInternal()

◆ mqttMessageInternal()

◆ postInit()

◆ publish()

◆ setupConnection()

◆ subscribe()

◆ unsubscribe()